Pen



FIG. 1 is a bottom view of a pen showing my new design.

FIG. 2 is a first side elevation view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a second side elevation view thereof.

FIG. 5 is a first end view thereof.

FIG. 6 is a second end view thereof.

FIG. 7 is an exploded side elevation view thereof; and,

FIG. 8 is an exploded top view thereof. 

CLAIM The ornamental design for a pen, as shown and described. 